Retractable knife



FIG. 1 is a perspective view of a retractable knife showing my new design, in a condition wherein rotary blade is retracted;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left end view thereof;

FIG. 7 is a right end view thereof;

FIG. 8 is a perspective view thereof, in a condition wherein rotary blade is projected;

FIG. 9 is a perspective view of a second embodiment of a retractable knife showing my new design, in a condition wherein rotary blade is retracted;

FIG. 10 is a top plan view thereof;

FIG. 11 is a front elevational view thereof;

FIG. 12 is a rear elevational view thereof;

FIG. 13 is a bottom plan view thereof;

FIG. 14 is a left end view thereof;

FIG. 15 is a right end view thereof; and,

FIG. 16 is a perspective view thereof, in a condition wherein rotary blade is projected. 

The ornamental design for a retractable knife, as shown and described. 